setParameters

A collection of the parameters used to configure your function. Each
parameter is a CompoundVariable and can be resolved by calling the
execute() method of the CompoundVariable (which should be done at
execution.)

getArgumentDesc

Return a list of strings briefly describing each parameter your function
takes. Please use JMeterUtils.getResString(resource_name) to grab a
resource string. Otherwise, your help text will be difficult to
internationalize.
This list is not optional. If you don't wish to write help, you must at
least return a List containing the correct number of blank strings, one
for each argument.